The debates between liberalism and the New Left, which broke out in the middle of the 1990s, are a phenomenon rarely seen among mainland Chinese intellectuals since 1949. They are large-scale, spontaneous debates without official manipulation or ideological constraint. The debates involve Chinese scholars on the mainland and overseas, and have drawn the attention of Hong Kong and Taiwan intellectuals. Several collective papers on the debates have been published, and other selected papers are in the process of being compiled and published. The debates are continuing. As an active participant in the debates and as a researcher in the history of Chinese thought in the 1980s and 1990s, I would like to summarize the main issues of the debates and to analyze why liberalism and the New Left emerged in the 1990s